Cylindrical tube for use in walling up wells with concrete



(ModeL) M. NELSON. GYLINDRIUAL TUBE FOR USE IN WALLING UP WELLS WITH CONCRETE,

CEMENT, 8w.

Patented Nov. 8,1881

[nzfenfarz UNITED STATES PATENT OFFICE.

MAGNUS NELSON, OF MARINE MILLS, MINNESOTA.

CYLINDRICAL TUBE FOR USE IN WALLING UP WELLS WITH CONCRETE, CEMENT, &c.

SPECIFICATION forming part of Letters Patent No. 249,389, dated November Application filed July 5, 1881. (Model.)

To all whom it may concern it to wall around the same,

i which is segmental in Be it known that I, MAGNUS NELsoN, of Marine Mills, in the county of Washington and State of Minnesotmwhave invented a new and useful Improvement in Formersfor Use in Gementing W'ells; and I do hereby declare that the following is a full, clear, and exact description of the same.

Where the earth is sufficiently solid and compact it is preferable, as a matter of economy, to apply cement to the sides'ot' wells, in

place of employing brick or stone, toform a l have devised an improved collapsible former for use in such application of cement. The same is shown in accompanyingdrawings, in Wl1ich Figure 1 is a sectional elevation, and Fig. 2 a plan view. I

The 'former is cylindrical in shape, and its body is mainly constructed of a series of longitudinal parallel strips or staves, a, each of cross-section. Thestaves are suitablysecured to two transversely-divided steel bands, I) b,which are arranged,one near each end of the former, on the inner side thereof.

A narrow iron plate,f, having thesame length as the staves a,is rigidly attached to the outer side of the stave, on one end of the bands I), so that it overlaps the contiguous stave on the other and opposite ends of saidbands.

To hold the former rigid, as required, during the operation of applying the cement, as

hereinafter described,I employ slotted hasps c and pivoted hooks e, that respectively fit over and enter staples 61, these devices being applied 4 1 upper portion.

a such formers,

to the ends of the bands I), so as to connect them,as shown.

For the purpose of lowering or hoisting the former in the well a rope, g, is attached to its I propose to use a series of the number being more or less,

and the latter drawn out ofthe F They are held rigidly in position by lugs according to the depth of the well. connected and h, that project from the lower end ofeach former and enter keepers on the upper end of the onebelow it.

The operation of the device is. as follows: one section of the tube is placed in the well,

upon the bottom thereof, and the space between the tube and the sides of the well filled with cement; then another section is placed on the top of the first, and the space between it'and the sides of the well filled up in like section, and so on until the surface of the ground is reached, and a continuous wall of cement is formed between said tube and the sides of the well, and when the cement is sufficiently set and firm the hasps of the upper section of the tube are removed well by means of the rope passed through the loops in the band of said section, as aforesaid, and the other sections of the tube removed in I am aware a collapsible former has been provided with racks and pi nions for adjusting their diameter as required in the operation of cementing wells, and I do not claim such device per so.

What I claim is- 1. The collapsible former provided with lugs h, attached to its lower end, and with keepers on its upper end, as shown and described, for

- the purpose of connecting a series of formers,

as specified. I

2. Thecombination, with the former constructed of vertical staves a, the divided bands I), and plate f, of the fastenings consisting of the hook and hasps 0, arranged as shown and described.

MAGNUS NELSON. Witnesses:

AUGUST LUNDGUEST, OLOF ANDERSON.

the same way. 7 

